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clutter matlab,Clutter Modeling

江永安
2023-12-01

Considerations for Setting Up a Constant Gamma Clutter Simulation

When you use constantGammaClutter, you must

configure the object for the situation you are simulating, and confirm that the

assumptions the software makes are valid for your system.Physical Configuration Properties

The constantGammaClutter object has

properties that correspond to physical aspects of the situation you are modeling.

These properties include:

Propagation speed, sample rate, and pulse repetition frequency of the signal

Operating frequency of the system

Altitude, speed, and direction of the radar platform

Depression angle of the broadside of the radar antenna arrayClutter-Related Properties

The object has properties that correspond to the clutter characteristics, location, and modeling fidelity. These properties include:

Gamma parameter that depends on the terrain type and system’s operating frequency.

Azimuth coverage and maximum range for the clutter simulation.

Azimuth span of each clutter patch. The software internally divides the

clutter ring into a series of adjacent, non-overlapping clutter

patches.

Clutter coherence time. This value indicates how frequently the software changes the set of random numbers in the clutter simulation.

In the simulation, you can use identical random numbers over a time interval or uncorrelated random numbers. Simulation behavior slightly differs from reality, where a moving platform produces clutter returns that are correlated with each other over small time intervals.Working with Samples or Pulses

The constantGammaClutter object has

properties that let you obtain results in a convenient format. Using the OutputFormat property, you can choose to have the

step method produce a signal that

represents:

A fixed number of pulses. You indicate the number of pulses using the NumPulses property of the object.

A fixed number of samples. You indicate the number of samples using the NumSamples property of the object. Typically, you use the number of samples in one pulse. In staggered PRF applications, you might find this option more convenient because the step output always has the same matrix size.Assumptions

The clutter simulation that constantGammaClutter provides is

based on these assumptions:

The radar system is monostatic.

The propagation is in free space.

The terrain is homogeneous.

The clutter patch is stationary during the coherence

time. Coherence time indicates how frequently

the software changes the set of random numbers in the clutter simulation.

Because the signal is narrowband, the spatial response and Doppler shift can be

approximated by phase shifts.

The radar system maintains a constant height during

simulation.

The radar system maintains a constant speed during

simulation.

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